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How does CarPlay still not have a brightness control? I leave my CarPlay perpetually in dark mode because light mode is searing in all but directly sunlight.

That would be controlled by the car itself? Surely must be a brightness slider for the infotainment system somewhere?

Not in Hyundai. The brightness controls have no impact when CarPlay starts up.

That should be controlled by the car, so just get a better car with a working light sensor? :)

Is it using the light sensor?

In my experience in a Subaru, a Toyota, and a Volvo, it seems to be connected to the car's light sensor (so it triggers at the same time as the automatic headlights). A third-party head unit I've tried was just always light.